chrome/browser/vr/font_fallback.h

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_VR_FONT_FALLBACK_H_
#define CHROME_BROWSER_VR_FONT_FALLBACK_H_

#include <string>

#include "third_party/icu/source/common/unicode/uchar.h"

namespace gfx {
class Font;
}  // namespace gfx

namespace vr {

// Return a font name which provides a glyph for the Unicode code point
// specified by character.
//   default_font: The main font for which fallbacks are required
//   c: a UTF-32 code point
//   preferred_locale: preferred locale identifier (if any) for |c|
//                     (e.g. "en", "ja", "zh-CN")
//
// The funtion, if it succeeds, sets |font_name|. Even if it succeeds, it may
// set |font_name| to the empty string if the character is supported by the
// default font.
//
// Returns:
//   * false, if the request could not be satisfied or if the provided default
//     font supports it.
//   * true, otherwis.
//
bool GetFallbackFontNameForChar(const gfx::Font& default_font,
                                UChar32 c,
                                const std::string& preferred_locale,
                                std::string* font_name);

}  // namespace vr

#endif  // CHROME_BROWSER_VR_FONT_FALLBACK_H_